What is the maximum number of electrons that can occupy the 2s orbital?
8
6
2
3
If Argon is a noble gas and its atomic number is 18, how many electrons can be found in the valence level?
8
18
36
6
Which of the following statements is true?
The energy of electrons decreases with increasing distance
Valence electrons are in the outermost shell
Electrons removed from atoms always increase the stability
Electrons circle the nucleus like Earth around the Sun
All of the following statements are true, EXCEPT _____.
sugars are found only in plants
pasta and cereals are good sources of carbohydrates
starch is composed of amylopectin and amylose
mammals store carbohydrates in the form of glycogen
Which set of functional groups is always found in sugars?
Ethers and carboxylic acids.
Hydroxyl groups and ethers.
Ethers and amines.
Amines and alcohols.
Carlos just finished an exhausting workout. Which of the following carbohydrates can be readily used by his body as a source of fuel?
Any kind of polysaccharide.
Glucose
Dietary fiber
Cellulose
Proteins are biological molecules made of _____.
sugars
amino acids
nucleotides
glycerol
What atoms are connected by a peptide bond?
Carbonyl carbon and carbonyl oxygen
Side chain groups
Carbonyl carbon and amino group nitrogen
Amine nitrogen and another amine nitrogen
Proteins in our skin, hair, and nails are called what?
Regulatory proteins
Storage proteins
Structural proteins
Transport proteins
Which of the following is NOT a type of chemical bond?
Polar covalent bond
Ionic bond
Covalent bond
Polar ionic bond
Which of the following type of bond normally forms between two non-metal atoms?
Ionic
Metallic
Plastic
Covalent
What is the definition of a chemical?
A material containing ionic bonds only
two or more molecules connected together by chemical bonds
Two or more atoms connected together by chemical bonds
A material containing only non-metals
Which of the following roles do lipids NOT play in our bodies?
Generate heat
Make up part of our cell membranes
Store energy
Act as hormones
Why does soap remove grease from pans when we wash dishes?
The whole soap molecule is non-polar, so it breaks apart fat
Soap sends a chemical message to fats to break up fat blobs
Soap molecules react with fats to break up fat blobs.
Part of the soap is polar and part is non-polar
All of the following statements are true about lipids, EXCEPT that _____.
lipids are biological molecules that are insoluble in water
all lipids are fats
steroid hormones like testosterone are lipids
lipids are good at storing energy
In covalently bonded molecules, oxidation and reduction are determined by:
reactants that are broken down
products that are synthesized
enzymes and coenzymes
uneven sharing of electrons
